Ah. Theres the rules then there's the reality of being in a working band. I did 25 years ish at least 3 gigs a week from dive bars with a few hundred people to venues with 3-4000 and all incident free. When it comes down to it the venue want the show to go on no matter what or you will not come back. Not having an earth on an amp rack that no one is gonna touch endangered no 1. Every thing has it's own internal fuse which will blow anyway. If we all follow health and safety to the letter nothing would get done. The only way you could prove you have done everything in your power to follow health and safety would be to have R.A.Ms for every gig. " tonight's show has been cancelled due to unsatisfactory risk assessment and method statements."
In my current role as an audio visual and data engineer I've seen guys spend 20 minute just trying to get their powered access platform through a door so they can fit a grill over an aircon duct, only for the battery to fail. So they closed the room off as it wasn't safe to squeeze past it and it might have take more than 20 minutes to fit the grill so you cant simply use a step ladder. I say down with the nanny state. Coffee cups with caution maybe hot!
it's a coffee, what do you expect. There used to be this thing called common sense. I get where your coming from and I know health and safety is there to protect us all but it's gone mad these days.